Index: DamEngine/trunk/src/Deltares.DamEngine.Interface/FillDamFromXmlInput.cs
===================================================================
diff -u -r1405 -r1536
--- DamEngine/trunk/src/Deltares.DamEngine.Interface/FillDamFromXmlInput.cs	(.../FillDamFromXmlInput.cs)	(revision 1405)
+++ DamEngine/trunk/src/Deltares.DamEngine.Interface/FillDamFromXmlInput.cs	(.../FillDamFromXmlInput.cs)	(revision 1536)
@@ -84,8 +84,20 @@
             if (inputAquiferSoils != null)
             {
                 soilList.AquiferDictionary = new Dictionary<Data.Geotechnics.Soil, bool>();
-                foreach (InputAquiferSoil aquiferSoil in inputAquiferSoils) {
-                    soilList.AquiferDictionary.Add(soilList.GetSoilByName(aquiferSoil.Soilname), aquiferSoil.IsAquifer);
+                foreach (InputAquiferSoil aquiferSoil in inputAquiferSoils)
+                {
+                    var soil = soilList.GetSoilByName(aquiferSoil.Soilname);
+                    if (!soilList.AquiferDictionary.ContainsKey(soil))
+                    {
+                        soilList.AquiferDictionary.Add(soil, aquiferSoil.IsAquifer);
+                    }
+                    else
+                    {
+                        if (aquiferSoil.IsAquifer)
+                        {
+                            soilList.AquiferDictionary[soil] = true;
+                        }
+                    }
                 }
             }
         }